Study On Optimization Of Controller Parameters And Output Voltage Regulation In ECPT System

Wireless Power Transmission(WPT) technique is a novel skill to transmit power which realizes the procedure of power transmission by indirectly linking from the donor to the receptor. This technique well eliminates various problems caused by traditional contacting methods, meets the strict safety requirements and adapts to solve the troubles from electric equipment using in complex situations( such like humid, flammable and combustible working environment) eventually provides numerous demands of safety, flexibility and reliability by human being.In the area of Wireless Power Transmission(WPT) technique, Electric-field Coupled Power Transfer(ECPT) Technique is valued by research groups and industrial enterprises domestic and overseas due to its special advantages such like that the coupling electric field is almost distributed between electrodes, the flexibility of the coupling mechanism of the system is high and the electromagnetic compatibility of the system is accepted. Full-bridge inverter, half-bridge inverter and class E power amplifier is widely used conversion of electrical energy network in ECPT system and the feature of which will be discussed in this paper. By comparing the performance, half-bridge inverter will be selected as the inverter of ECPT system. This paper will introduce the reach of the half-bridge ECPT system in several aspects as follows,(1) After deciding use the electrical energy conversion topology of the ECPT system, this paper analyzes the working principle and feature of an existing compound harmonic compensation network and combines it into the ECPT system to design a method determining the system variables of improving the transmission power efficiency.(2) This paper utilize the method of generalized state space averaging(GSSA) model to establish a GSSA based ECPT system which transfers the complex model in high order nonlinear time domain to frequency domain linear differential model to adapt to the problem of hard theatrically analyzing the system caused by the complex factors(high order, complicated structure, nonlinear switch) in ECPT system. And this paper also demonstrates the effectiveness of the GSSA model by constructing topology model by Matlab/Simulink.(3) According to the problem of the declining quality of output voltage, poor system robustness and even instable system caused by sensitivity of system parameters(load resistance tolerance and equivalent capacitance coupling mechanism) in ECPT system, this paper presents a new method automatic optimizing the system controlling parameters multi-objective genetic algorithm with multi-constraints(NSGA-II). More precisely, it is basically a half-bridge ECPT system based GSSA model and it uses the NSGA-II algorithm to automatically search the optimization of the PID controlling parameters and all the things are combined to construct a systematic regulating output controller. In the end, this paper designs an experiment system by Matlab/Simlink to evaluate the controlling effectiveness. By the performance of the experiment, it is verified that the controller designed by this paper can well control the system output, improve the rise time of a closed loop system, reduce the steady state error and enhance the robustness of the variable parameters of the system.